❔ EF Core Code-first relationships

Hi there, I am trying to create a coffee vending machine application. But, I can't quite work the relationships around my head.

The project requires to have pre-defined coffees (espresso, macchiato, latte, etc.) so that the user would be able to pick from, and characteristics (sugar, milk, creamer, etc.) that can be added to a picked coffee.

I've created the following entities:

public class Coffee
    {
        [Key]
  [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        [Required] 
        [StringLength(400)] 
        public string Description { get; set; }
        public int Stock { get; set; }
    }

public class Coffee
    {
        [Key]
  [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        [Required] 
        [StringLength(400)] 
        public string Description { get; set; }
        public int Stock { get; set; }
    }

public class Characteristic
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        public int Stock { get; set; }
    }

public class Characteristic
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        public int Stock { get; set; }
    }

I want to be able to store the created coffees linked with the chosen characteristics in a separate table "SoldCoffes". To my understanding, I need to have one-to-many relationship, but I'm kind of stuck on this one.

Any help would be appreciated.

❔ EF Core Code-first relationships

public class Coffee
    {
        [Key]
  [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        [Required] 
        [StringLength(400)] 
        public string Description { get; set; }
        public int Stock { get; set; }
    }

public class Coffee
    {
        [Key]
  [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        [Required] 
        [StringLength(400)] 
        public string Description { get; set; }
        public int Stock { get; set; }
    }

public class Characteristic
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        public int Stock { get; set; }
    }

public class Characteristic
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required] 
        [StringLength(50)] 
        public string Name { get; set; }
        public int Stock { get; set; }
    }

❔ EF Core Code-first relationships

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